Pattern for casting dovetails



(No Model.)

B. KUHN. PATTERN FOR CASTING DOVETAILS.

No. 585,039. Patented June 22,1897.

m: norms PETERS co. vuoroumo. wAsmNn'wm n. c.

ing Withdrawn and the position assumed by UNITED STATES PATENT @FFIQE.

EDMUND KUIIN, OF NE VV ALBANY, INDIANA.

PATTERN FOR CASTING DOVETAILS.

$IPECIFICATION forming part of Letters Patent No. 585,039, dated June 22, 1897.

Application filed March 17, 1897.

To all whom it may concern,-

Be it known that I, EDMUND KUHN, of New Albany, in the county of Floyd and State of Indiana, have invented certain new and useful Improvements in Patterns for Casting Dovetails; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable othersskilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to improvements inpatterns for casting dovetails; and it consists in the particular construction and combination of parts hereinafter fully described, and particularly pointed out in the claims.

The object of my invention is to so construct the parts of the pattern that a perfect mold can be made by preventing the breaking of the sand when the cope of the flask is being removed. 7

In the accompanying drawings, Figure 1 is a vertical section showing the parts of the pattern in position in the flask and the sand packed around them. Fig. 2 is a similar view showing the cope of the flask in the act of bethe movable parts of the pattern. Fig. 3 is a detached perspective view of the pattern with the caps removed. Fig. 4 is an interior perspective view of one of the caps removed.

In the drawings, a indicates that part of the pattern which forms the bottom or other part of the stove upon which it is desired to cast the dovetail, and b projections. These proj ections are considerably inclined at their outer sides, as shown, and preferably slightly inclined at their inner sides. The inner sides of the projections 19 are provided with central openings 0 and at the inner edge'of their tops with the pins d.

Caps 6 are provided, which are placed over the projections, as shown in Fig. 1, and the upper walls or tops of these caps are provided with openings f, which receive the pins d of the projections, and these caps are provided Serial No. 628,015. (No model.)

at the lower edges of their side walls with inwardly-extending lugs 2 which enter the openings c, as shown in Fig. 1.

In operation the caps are placed in position and the sand packed around them, as shown in Fig. 1, the pins (1 serving to hold the caps in position as the sand is being packed. When the cope is removed, as illustrated in Fig. the caps are lifted, carrying them out of engagement with the pins d of the projections, the openings 0 inthe projections being longer than the pins d to permit this action. The lugs z, engaging the upper walls of the openings 0, cause the caps to turn or tip, as illusstrated in Fig. 2, which throw the caps out of the inclines formed thereby in the sand, and the cope of the flask is removed without any injury whatever to the inclined cavities formed by the caps and projections, the caps turning so easily as to prevent any breaking of the sand.

From the above description it will be seen that the lugs t, coacting with the openings 0 in the projections, cause the caps to be automatically withdrawn from the sand, and so easily as to prevent any injury to the mold.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, is a 1. A dovetail-pattern consisting of the base having a projection, a cap placed over the projection and forming an inclined inner side therefor, the projection having at its inner side a transversely-extendin g opening provided with an upper wall, and the cap having a horizontal inwardly-projecting lug passing loosely within said opening and adapted to engage said upper wall when the cap is lifted and cause the same to tilt for the purpose described, substantially as shown.

2. A dovetail-pattern consisting of the base having a projection, a cap placed over the projection and forming an inclined inner side therefor, the projection and cap having respectively pins and openings at their upper side, the projection having at its inner side a transversely-extending opening provided with an upper wall, and the cap provided with greater than the length of said pins, and the an inwardly-projecting lug entering loosely cap having an inwardly-extending lug entersaid opening, substantially as described. ing loosely said opening and operating as de 3. A dovetail-pattern consisting of a base scribed. 5 having a projection provided with pins at its In testimony whereof I afiix my signature I 5 upper side, a detachable cap placed over said in presence of two witnesses.

projection and forming an inclined inner side EDMUND KUIIN. therefor, the cap having openings in its upper Vitn esses: side to receive said pins, the inner side of the ED. G. PLATT,

1o projection having an opening of a length JAMES II. VATKIN. 

